/*
 * Copyright The Stargate Authors
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package io.stargate.it.storage;

import java.util.Deque;
import java.util.concurrent.ConcurrentLinkedDeque;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

public class ShutdownHook {

  private static final Logger LOG = LoggerFactory.getLogger(ShutdownHook.class);

  private static final Deque<AutoCloseable> resources = new ConcurrentLinkedDeque<>();

  static {
    Thread hooks =
        new Thread("storage-shutdown-hook") {
          @Override
          public void run() {
            for (AutoCloseable resource : resources) {
              try {
                resource.close();
              } catch (Exception e) {
                LOG.error("Unable to close resource on shutdown: {}", e.getMessage(), e);
              }
            }
          }
        };

    Runtime.getRuntime().addShutdownHook(hooks);
  }

  public static void add(AutoCloseable resource) {
    // Last added - first closed (see the shutdown hook thread)
    resources.addFirst(resource);
  }

  public static void remove(AutoCloseable resource) {
    resources.remove(resource);
  }
}
